Right in the middle of the Sahara desert, in the dunes of northern Niger, there’s a circle which is clearly not a natural formation. The circle itself is roughly 52 metres across, but if we zoom out a little, we can see eight other markings which mark the sides and corners of a huge square area, about 620 metres on each side. This French website claims that French soldiers created similar looking circles and markings elsewhere in the Sahara “at the beginning of the aviation era”, although the reason why is unclear. Although the one in the article…